The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 24 hours. Why not try and solve them ahead of time?
Tutorial in all languages in bytes. Achievements Cheevos Holes Languages Medals Miscellaneous All Holes 12 Days of Christmas 24 Game 99 Bottles of Beer Abundant Numbers Abundant Numbers (Long) Arabic to Roman Arithmetic Numbers Arrows Ascending Primes ASCII Table Billiards brainfuck Calendar Card Number Validation Catalan Numbers Catalan’s Constant Christmas Trees Collatz Continued Fractions CSS Colors Cubes Day of Week DFA Simulator Diamonds Divisors Emirp Numbers Emirp Numbers (Long) Emojify Evil Numbers Evil Numbers (Long) Factorial Factorisation Farey Sequence Fibonacci Fizz Buzz Foo Fizz Buzz Bar Forsyth–Edwards Notation Fractions Game of Life Gijswijt’s Sequence Happy Numbers Happy Numbers (Long) Hexdump Hilbert Curve Intersection Inventory Sequence ISBN Jacobi Symbol Kaprekar Numbers Kolakoski Constant Kolakoski Sequence Leap Years Levenshtein Distance Leyland Numbers ln 2 Look and Say Lucky Numbers Lucky Tickets Mahjong Mandelbrot Maze Medal Tally Minesweeper Morse Decoder Morse Encoder Multitap Input Musical Chords N Queens Niven Numbers Niven Numbers (Long) Number Spiral Odious Numbers Odious Numbers (Long) Ordinal Numbers PalindromemordnilaP Pangram Grep Partition Numbers Pascal’s Triangle Pernicious Numbers Pernicious Numbers (Long) Poker Polyominoes Prime Numbers Prime Numbers (Long) Proximity Grid QR Decoder Quine Recamán Repeating Decimals Reverse Polish Notation Reversi Rijndael S-box Rock-paper-scissors-Spock-lizard Roman to Arabic ROT13 Rule 110 Scrambled Sort Set Seven Segment SI Units Sierpiński Triangle Smith Numbers Spelling Numbers Star Wars GPT Star Wars Opening Crawl Sudoku Sudoku (Fill-in) Ten-pin Bowling Tic-tac-toe Time Distance Tongue-twisters Topological Sort Tower of Hanoi Transpose Sentence Trinomial Triangle United States Vampire Numbers Van Eck Sequence Zeckendorf Representation Zodiac Signs γ λ π τ φ √2 𝑒 Alphabetic Numbers Apéry’s Constant Binary Lambda Calculus Connect Four Crossword CSS Colors (Inverse) CSS Grid Ellipse Perimeters Flags Floyd-Steinberg Dithering Gray Code Decoder Gray Code Encoder Hexagonal Spiral Highly Composite Numbers NFA Simulator Numbrix Odd Polyomino Tiling p-adic Expansion Polygon Triangulations QR Encoder Quadratic Formula Rectangle Fill Semiprime Numbers Smooth Numbers Snake Sphenic Numbers Taxicab Numbers Turtle Tutorial All Languages ><> ALGOL 68 ArkScript Assembly AWK Bash BASIC Berry brainfuck C C# C++ Civet Clojure COBOL Coconut Common Lisp Crystal D Dart Elixir Erlang F# Factor Forth Fortran Gleam Go GolfScript Groovy Haskell Hexagony J Janet Java JavaScript jq Julia K Kotlin Lua Nim OCaml Pascal Perl PHP PowerShell Prolog Python R Raku Rockstar Ruby Rust Scheme sed SQL Swift Tcl TeX V VimL Wren Zig 05AB1E APL Arturo Befunge BQN CJam CoffeeScript Egel Fennel Harbour Hare Haxe Hush Hy iogii Knight Lily Luau Odin Picat Qore Racket Rebol Rexx Scala Squirrel Stax Uiua Umka Vala Vyxal Bytes Chars Scoring Bytes Chars Language All ><> ALGOL 68 ArkScript Assembly AWK Bash BASIC Berry brainfuck C C# C++ Civet Clojure COBOL Coconut Common Lisp Crystal D Dart Elixir Erlang F# Factor Forth Fortran Gleam Go GolfScript Groovy Haskell Hexagony J Janet Java JavaScript jq Julia K Kotlin Lua Nim OCaml Pascal Perl PHP PowerShell Prolog Python R Raku Rockstar Ruby Rust Scheme sed SQL Swift Tcl TeX V VimL Wren Zig Experimental Language 05AB1E APL Arturo Befunge BQN CJam CoffeeScript Egel Fennel Harbour Hare Haxe Hush Hy iogii Knight Lily Luau Odin Picat Qore Racket Rebol Rexx Scala Squirrel Stax Uiua Umka Vala Vyxal Hole All 12 Days of Christmas 24 Game 99 Bottles of Beer Abundant Numbers Abundant Numbers (Long) Arabic to Roman Arithmetic Numbers Arrows Ascending Primes ASCII Table Billiards brainfuck Calendar Card Number Validation Catalan Numbers Catalan’s Constant Christmas Trees Collatz Continued Fractions CSS Colors Cubes Day of Week DFA Simulator Diamonds Divisors Emirp Numbers Emirp Numbers (Long) Emojify Evil Numbers Evil Numbers (Long) Factorial Factorisation Farey Sequence Fibonacci Fizz Buzz Foo Fizz Buzz Bar Forsyth–Edwards Notation Fractions Game of Life Gijswijt’s Sequence Happy Numbers Happy Numbers (Long) Hexdump Hilbert Curve Intersection Inventory Sequence ISBN Jacobi Symbol Kaprekar Numbers Kolakoski Constant Kolakoski Sequence Leap Years Levenshtein Distance Leyland Numbers ln 2 Look and Say Lucky Numbers Lucky Tickets Mahjong Mandelbrot Maze Medal Tally Minesweeper Morse Decoder Morse Encoder Multitap Input Musical Chords N Queens Niven Numbers Niven Numbers (Long) Number Spiral Odious Numbers Odious Numbers (Long) Ordinal Numbers PalindromemordnilaP Pangram Grep Partition Numbers Pascal’s Triangle Pernicious Numbers Pernicious Numbers (Long) Poker Polyominoes Prime Numbers Prime Numbers (Long) Proximity Grid QR Decoder Quine Recamán Repeating Decimals Reverse Polish Notation Reversi Rijndael S-box Rock-paper-scissors-Spock-lizard Roman to Arabic ROT13 Rule 110 Scrambled Sort Set Seven Segment SI Units Sierpiński Triangle Smith Numbers Spelling Numbers Star Wars GPT Star Wars Opening Crawl Sudoku Sudoku (Fill-in) Ten-pin Bowling Tic-tac-toe Time Distance Tongue-twisters Topological Sort Tower of Hanoi Transpose Sentence Trinomial Triangle United States Vampire Numbers Van Eck Sequence Zeckendorf Representation Zodiac Signs γ λ π τ φ √2 𝑒 Experimental Hole Alphabetic Numbers Apéry’s Constant Binary Lambda Calculus Connect Four Crossword CSS Colors (Inverse) CSS Grid Ellipse Perimeters Flags Floyd-Steinberg Dithering Gray Code Decoder Gray Code Encoder Hexagonal Spiral Highly Composite Numbers NFA Simulator Numbrix Odd Polyomino Tiling p-adic Expansion Polygon Triangulations QR Encoder Quadratic Formula Rectangle Fill Semiprime Numbers Smooth Numbers Snake Sphenic Numbers Taxicab Numbers Turtle Tutorial # Golfer Points Bytes Time Submitted 787th voytxt 🇨🇿 0 63 189ms 17 Apr 2025 787th FlyingPenguin223 0 63 51ms 17 Apr 2025 787th DialFrost 🇸🇬 0 63 185ms 17 Apr 2025 787th DialFrost 🇸🇬 0 63 5ms 17 Apr 2025 787th DialFrost 🇸🇬 0 63 49ms 17 Apr 2025 787th pardouin 🇫🇷 0 63 176ms 17 Apr 2025 787th Shanethegamer 🇺🇸 0 63 5ms 17 Apr 2025 787th Shanethegamer 🇺🇸 0 63 54ms 17 Apr 2025 787th GolfingSuccess 🇬🇷 0 63 6ms 17 Apr 2025 787th HumanoidCPU 0 63 177ms 18 Apr 2025 787th HumanoidCPU 0 63 7ms 18 Apr 2025 787th HumanoidCPU 0 63 50ms 18 Apr 2025 787th CaedenHarper 🇨🇦 0 63 163ms 18 Apr 2025 787th CaedenHarper 🇨🇦 0 63 6ms 18 Apr 2025 787th CaedenHarper 🇨🇦 0 63 56ms 18 Apr 2025 787th dokutan 0 63 158ms 28 Apr 2025 787th dokutan 0 63 6ms 28 Apr 2025 787th Jigglypuffed 0 63 50ms 19 Jul 2025 787th penous 0 63 14ms 2 Aug 2025 787th YellowDudeIsMe 0 63 14ms 14 Aug 2025 787th albanian-laundromat 0 63 6ms 22 Aug 2025 787th snoozingnewt 🇨🇦 0 63 183ms 15 Sep 2025 787th snoozingnewt 🇨🇦 0 63 6ms 15 Sep 2025 787th snoozingnewt 🇨🇦 0 63 52ms 15 Sep 2025 787th luuumine 🇫🇷 0 63 2ms 10 Nov 2025 787th JOrE20 0 63 6ms 18 Nov 2025 787th kayaulai 0 63 93ms 23 Nov 2025 828th Shanethegamer 🇺🇸 0 64 142ms 20 Nov 2024 828th error256 0 64 131ms 21 Nov 2024 828th error256 0 64 1,021ms 21 Nov 2024 828th emgordon154 0 64 2ms 26 Nov 2024 828th Liniarc 0 64 13ms 26 Nov 2024 828th MeWhenI 🇻🇦 0 64 49ms 12 Dec 2024 828th luuumine 🇫🇷 0 64 1,021ms 16 Oct 2025 828th GolfingSuccess 🇬🇷 0 64 3ms 12 Nov 2025 828th GolfingSuccess 🇬🇷 0 64 155ms 2 Dec 2025 828th Shanethegamer 🇺🇸 0 64 152ms 4 Dec 2025 828th GolfingSuccess 🇬🇷 0 64 110ms 15 Dec 2025 828th amazingalek 🇳🇴 0 64 11ms 16 Dec 2025 828th error256 0 64 150ms 3 Feb 2026 828th pardouin 🇫🇷 0 64 167ms 4 Feb 2026 842nd Shanethegamer 🇺🇸 0 65 8ms 20 Nov 2024 842nd stefangimmillaro 0 65 10ms 20 Nov 2024 842nd kg583 🇺🇸 0 65 10ms 21 Nov 2024 842nd khvdm 0 65 12ms 21 Nov 2024 842nd edsrzf 🇳🇿 0 65 10ms 21 Nov 2024 842nd hallvabo 🇳🇴 0 65 11ms 24 Nov 2024 842nd ovs-code 🇩🇪 0 65 12ms 25 Nov 2024 842nd GolfingSuccess 🇬🇷 0 65 12ms 25 Nov 2024 842nd AlephSquirrel 0 65 10ms 25 Nov 2024 842nd AlephSquirrel 0 65 50ms 25 Nov 2024 842nd pardouin 🇫🇷 0 65 11ms 25 Nov 2024 842nd btnlq 0 65 10ms 26 Nov 2024 842nd CaedenHarper 🇨🇦 0 65 12ms 26 Nov 2024 842nd emgordon154 0 65 10ms 26 Nov 2024 842nd inventshah 0 65 11ms 26 Nov 2024 842nd sean-niemann 🇺🇸 0 65 167ms 26 Nov 2024 842nd stefangimmillaro 0 65 158ms 26 Nov 2024 842nd duckyluuk 🇳🇱 0 65 10ms 26 Nov 2024 842nd m-tkach 🇺🇦 0 65 11ms 26 Nov 2024 842nd ovs-code 🇩🇪 0 65 2ms 26 Nov 2024 842nd Alex-x90 🇺🇸 0 65 10ms 28 Nov 2024 842nd lifthrasiir 🇰🇷 0 65 10ms 30 Nov 2024 842nd zacjl 0 65 11ms 1 Dec 2024 842nd zacjl 0 65 7ms 1 Dec 2024 842nd sisyphus-ppcg 🇦🇺 0 65 12ms 2 Dec 2024 842nd JunkIce 0 65 12ms 3 Dec 2024 842nd SirBogman 🇺🇸 0 65 11ms 3 Dec 2024 842nd xsot 🇸🇬 0 65 11ms 4 Dec 2024 842nd ndren 0 65 11ms 5 Dec 2024 842nd CornerMercury 🇬🇧 0 65 10ms 5 Dec 2024 842nd lukegustafson 🇺🇸 0 65 10ms 7 Dec 2024 842nd Europe2048 0 65 13ms 7 Dec 2024 842nd neel11235813 0 65 11ms 9 Dec 2024 842nd Seek64 🇩🇪 0 65 11ms 10 Dec 2024 842nd MeWhenI 🇻🇦 0 65 2ms 11 Dec 2024 842nd antimon2 🇯🇵 0 65 11ms 16 Dec 2024 842nd error256 0 65 6ms 16 Dec 2024 842nd edsrzf 🇳🇿 0 65 7ms 18 Dec 2024 842nd bizy-coder 0 65 11ms 28 Dec 2024 First Prev 801–880 of 3,423 Next Last